3652-84-4Relevant articles and documents
Loss of Alkanes from Ionized Branched Chain Ethers. Metastable Decomposition from an Electronically Excited State?
Hudson, Charles E.,Lerner, Rob D.,Aleman, Ruben,McAdoo, David J.
, p. 155 - 157 (1980)
Ethers of the type R1CH(CH3)OR2 show a metastable peak for the loss of R1H in their mass spectra.Loss of C2H5D is the principal decomposition of metastable C2H5CH(CD3)O(+.)CH3, demonstrating that vinyl ether ions are formed by the metastable losses of alkanes.Thermochemical and orbital symmetry considerations support the hypothesis that the losses of alkanes occur from an electronically excited state of the ether ions.Other ether ions with the oxygen bonded to a nonterminal carbon also lose alkanes.N,N-Dimethyl-s-butylamine, di-sec-butyl sulfide, sec-butylbenzene, and tert-pentyl ether ions do not lose alkanes.
Method of preparing beta-d2 alkyl acid compounds
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Paragraph 0061; 0068; 0107; 0110-0113; 0119; 0125, (2018/06/26)
The invention provides a method of preparing beta-d2 alkyl acid compounds. The method includes steps of: 1) performing a reduction reaction to a compound A with LiAlD4 to obtain a compound B; 2) performing -OD group protective reaction to the compound B to obtain an intermediate C; 3) performing a bromination reaction to the intermediate C to obtain a compound D; 4) under alkaline condition, performing a substitution reaction to the compound D and acetic acid to obtain the beta-d2 alkyl acid compounds. In the method, the alkyl acid, which is low in cost and is easy to obtain, is used as the initial raw material and is subjected to LiAlD4 reduction reaction, the -OD group protective reaction, the bromination reaction and the acetic acid substitution reaction to prepare the beta-d2 alkyl acid compounds. The method has simple process route and is free of expensive catalysts and the like during the reactions, is low in cost, and is high in total yield of the beta-d2 alkyl acid compounds. The method, when being amplified to gram-scale, has stable yield and good repeatability and is practicable and available.
Intermediacy of ion neutral complexes in the fragmentation of short-chain dialkyl sulfides
Filsak,Budzikiewicz
, p. 601 - 610 (2007/10/03)
The main fragmentation processes after electron ionization of butyl methyl and butyl ethyl sulfides are rationalized by the intermediacy of the ion neutral complex [RSH · methylcyclopropane](+·) as demonstrated by extensive labeling and collision activation studies.
Gas-Phase Chemistry of CH3SOH, (-)CH2(+)SHOH, CH3SO(.), and (.)CH2SOH by Neutralization-Reionization Mass Spectrometry
Turecek, Frantisek,Drinkwater, Donald E.,McLafferty, Fred W.
, p. 7696 - 7701 (2007/10/02)
The kinetically unstable molecules methanesulfenic acid (CH3SOH, 1) and its ylide isomer ((-)CH2(+)SHOH, 2) and the isomeric radicals CH3SO(.) and (.)CH2SOH exist as distinct species in the gas phase.CH3SOH was generated by flash-vacuum pyrolysis of methyl tert-butyl sulfoxide and by neutralization of the corresponding cation radical.The ylide (-)CH2(+)SHOH was prepared by neutralizaton of the distonic ion, (.)CH2(+)SHOH, generated from di-n-butyl sulfoxide by double hydrogen rearrangement.Upon collisional activation CH3SOH decomposes to CH3(.) and (.)SOH, while(-)CH2(+)SHOH affords mainly (.)CH2SH and (.)OH.Collisionally activated dissociation (CAD) spectra of the corresponding ions also distinguish these (C,H4,O,S)(.+) isomers.The isomeric radicals CH3SO(.) and (.)CH2SOH and ions CH3SO(+) and CH2SOH(+) were characterized through their neutralization-reionization and CAD mass spectra, respectively.Decomposition mechanisms consistent with deuterium labeling are proposed, and the relative stabilities of the (C,H4,O,S) isomers are estimated by MNDO calculations.
